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远处山林之中，特七已是恨得牙痒痒。Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:好在知道一点，娶了徐彤之后将来可以获得徐家的庞大利益。Is deliberate practice really 10,000 hours of repeated practice?In the field of computers, software environment refers to a software system running on computer hardware that drives computers and their peripherals to achieve a certain purpose. It also mainly refers to the running environment of the software, such as XP, Linux, and the peripheral software needed for the software to run, etc. In addition, it also includes application layer software other than the target software, which often has great influence when it comes to software interaction.